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Created new repo for linux scripts

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Tristan Ancelet 2023-11-02 11:47:01 -05:00
parent fbe180a130
commit 03ea88b46b
3 changed files with 4 additions and 107 deletions
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.gitmodules vendored Normal file
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[submodule "Linux/scripts"]
path = Linux/scripts
url = gitea@git.arcanium.tech:tristan/myscripts

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Linux/scripts Submodule

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Subproject commit 5ce434c7a7c4100a3f3e2755d375cac67c13572e

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Linux/scripts/do-daily-btrfs-snapshot.sh
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#!/usr/bin/bash
###############################################################################
# do-daily-backup.sh #
###############################################################################
# This script is my attempt at replicating the same function that timeshift #
# performs. This is a very simplified script to handle automated btrfs #
# snapshots via a daily cron entry. #
# #
# EX: #
# ``` #
# 0 0 * * * /path/to/script #
# ``` #
# #
# Afer putting it in your crontab it will automatically handle your making #
# snapshots for your system and will only make up to the limit you set with #
# LIMIT. #
# #
# You will also have to configure your own subvols in the array decleration #
# SUBVOLS following the same format in the comments above it. #
# #
###############################################################################
# BEGIN: Variables
## Reusable vars
DATE=`date +%Y-%m-%d`
### Getting the name of the script (as it will be the first thing passed to bash when executing)
SCRIPT=`basename $0`
BACKUP_DIR=/.backups
### Setting dir to house log files
LOG_DIR=/var/log/$SCRIPT
LOG_FILE=$LOG_DIR/$DATE.log
## The amount of backups that are allowed of each configured subvols
LIMIT=5
## Because cron fucks our env, and loading /etc/bashrc doesn't always fix it
alias btrfs='/usr/bin/btrfs'
## The subvols that we want to backup
### <actual-directory>:<name-of-backup-dir>
declare -a SUBVOLS=(
/:root
/home:home
)
## To use to seperate named manual backups from automatic ones
DATE_REGEX='[0-9]{4}-[0-9]{2}-[0-9]{2}'
# END: Variables
# BEGIN: Pre-Work Checks
## This will check to make sure that the log directory has been created, if not it will create it
[[ ! -d $LOG_DIR ]] && mkdir -p $LOG_DIR
## Setting up the script to direct all output to the log file for this snapshot session
exec > $LOG_FILE
# END: Pre-Work Checks
# BEGIN: Work
for SUBVOL_INFO in ${SUBVOLS[@]}; do
## Stripping the delemited info out of the subvol entry
OIFS=$IFS
IFS=':'
read DIR NAME <<< "$SUBVOL_INFO"
IFS=$OIFS
echo "Subvol : $DIR, Name: $NAME"
SUBVOL_BACKUP_DIR=$BACKUP_DIR/$NAME
## This will handle creating the backup directory as well as the specific snapshot directory as well
[[ ! -d $SUBVOL_BACKUP_DIR ]] && mkdir -p $SUBVOL_BACKUP_DIR
## Implemented it this way so that it's less complex to handle when there are more backups than we are
## configured to keep. Definately a rather stupid way to implement it, but it works and requires less logic to handle
while true; do
## So that any manual ones I do (named pre-upgrade, etc) will remain. And it will only delete the
## Automatic timestamped ones
declare -a backups=( $( ls -1 $SUBVOL_BACKUP_DIR | grep -Eo $DATE_REGEX ) )
echo "${#backups[@]} backups were found the backup dir $SUBVOL_BACKUP_DIR"
if [[ ${#backups[@]} -ge $LIMIT ]]; then
SNAPSHOT_PATH="$SUBVOL_BACKUP_DIR/${backups[0]}"
echo "${#backups[@]} was found to be equal to or greater than $LIMIT. Deleting $SNAPSHOT_PATH."
btrfs subvol del "$SUBVOL_BACKUP_DIR/${backups[0]}"
else
break
fi
## Unsetting the backups list so that it can be reloaded again
unset backups $SNAPSHOT_PATH
done
SNAPSHOT=$SUBVOL_BACKUP_DIR/$DATE
## If the snapshot doesn't already exist, then create a new read-only snapshot
[[ ! -d $SNAPSHOT ]] && btrfs subvol snapshot -r $DIR $SNAPSHOT
done
# END: Work